When your fixed term ends they can't demand repayment of the whole thing, you'll just be dumped into whatever tracker/SVR/whatever mortgage it becomes at the end of the fixed term. You'll still have to make those new monthly payments regardless of how you earn your money.
It's no different from getting a mortgage with job X paying £Y/year and then changing jobs and possibly earning less. They don't care as you've already got the mortgage by then, and they don't care if you keep making your repayments.
Your now freelance circumstance only comes into play if you want to change mortgages.
Depending on what rate your mortgage becomes at the end of the fixed deal you might just be better off keeping it rather than the hassle of getting a new contractor/freelancer mortgage (at generally higher rates due to increased risk).
When your fixed term ends they can't demand repayment of the whole thing, you'll just be dumped into whatever tracker/SVR/whatever mortgage it becomes at the end of the fixed term. You'll still have to make those new monthly payments regardless of how you earn your money.
It's no different from getting a mortgage with job X paying £Y/year and then changing jobs and possibly earning less. They don't care as you've already got the mortgage by then, and they don't care if you keep making your repayments.
Your now freelance circumstance only comes into play if you want to change mortgages.
Depending on what rate your mortgage becomes at the end of the fixed deal you might just be better off keeping it rather than the hassle of getting a new contractor/freelancer mortgage (at generally higher rates due to increased risk).